Supangat, Supangat, and Sugeng Marsudi. “The Importance of Transformational Leadership and Its Influence on Crew Performance on Ships”. JURNAL APLIKASI PELAYARAN DAN KEPELABUHANAN 15, no. 2 (May 26, 2025): 275–279. Accessed December 20, 2025. https://pdp-journal.hangtuah.ac.id/index.php/jurnal/article/view/144.